Semiconductor nanoparticles and thin film containing the same

• US 20040007169A1
• Filed: 01/28/2003
• Published: 01/15/2004
• Est. Priority Date: 01/28/2002
• Status: Abandoned Application

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Ohtsu, Takeshi, Saito, Yasuko, Kawa, Manabu
• Application Number:
  US10/352,111
• Publication Number:
  US 20040007169A1
• Time in Patent Office: Days
• US Class Current: 117/84
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01G 11/00 Compounds of cadmium
• CPC Class Codes: C01G 9/02 Oxides; Hydroxides
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C09C 1/04 Compounds of zinc C09C1/0003, C09C1/0009, C09C1/0015, C09C1/0078 take precedence
• CPC Class Codes: C09C 1/10 Compounds of cadmium C09C1/0009, C09C1/0015, C09C1/0078 take precedence
• CPC Class Codes: C09C 3/10 Treatment with macromolecular organic compounds C09C3/006 takes precedence
• CPC Class Codes: C30B 29/605 Products containing multiple oriented crystallites, e.g. columnar crystallites
• CPC Class Codes: C30B 7/00 Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions from molten solvents C30B9/00; by normal or gradient freezing C30B11/00; under a protective fluid C30B27/00
• CPC Class Codes: C30B 7/005 Epitaxial layer growth

Abstract

Semiconductor nanoparticles, having a poly(alkylene glycol) residue attached to the surface of semiconductor crystals, exhibit hydrophilicity, a non-specific adsorbing property to biosubstances, and absorption and luminescence characteristics controlled by aquantum effect of the semiconductor crystals.

Claims

1. Semiconductor particles comprising

semiconductor crystals;

and

at least one poly(alkylene glycol) residue attached to the semiconductor crystals.

2. The semiconductor particles according to claim 1, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via a group having a P═

O structure, an amino group, or a mercapto group.

3. The semiconductor nanoparticles according to claim 1, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via an oxygen atom in a functional group represented by the following formula (1):

4. The semiconductor nanoparticles according to claim 3, wherein at least one of R¹ and R² is a hydroxyl group.

5. The semiconductor nanoparticles according to claim 3, wherein the functional group represented by the formula (1) and the at least one poly(alkylene glycol) residue are linked via an alkylene group.

6. The semiconductor nanoparticles according to claim 5, wherein the alkylene group is an optionally-substituted alkylene group having 6-20 carbons.

7. The semiconductor nanoparticles according to claim 6, wherein the alkylene group is substituted with a substituent selected from the group consisting of a halogen atom, a nitro group, a hydroxyl group, a carboxyl group, an alkyl group having 8 or less carbon atoms, an alkoxyl group having 4 or less carbon atoms, and an aryl group having 4 or less carbon atoms.

8. The semiconductor nanoparticles according to claim 3, wherein the at least one poly(alkylene glycol) residue and the functional group represented by the formula (1) are each part of a compound represented by the following formula (10) that is attached to the semiconductor crystals:

9. The semiconductor nanoparticles according to claim 1, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via the amino group.

10. The semiconductor nanoparticles according to claim 9, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via an ω

-aminofatty acid residue.

11. The semiconductor nanoparticles according to claim 1, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via the mercapto group.

12. The semiconductor nanoparticles according to claim 11, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via an ω

-mercaptofatty acid residue.

13. The semiconductor nanoparticles according to claim 1, wherein the at least one poly(alkylene glycol) residue comprises a polyethylene glycol residue.

14. The semiconductor nanoparticles according to claim 13, wherein the at least one polyethylene glycol residue comprises a triethylene glycol monoalkyl ether residue.

15. The semiconductor nanoparticles according to claim 1, wherein the semiconductor crystals comprise a main constituent selected from the group consisting of a group II-group VI compound semiconductor composition, a group III-group V compound semiconductor composition, and a metal oxide composition.

16. The semiconductor nanoparticles according to claim 1, wherein the semiconductor crystals have a core-shell structure.

17. A method of making semiconductor nanoparticles, the method comprising

bonding at least one poly(alkylene glycol) residue to semiconductor crystals;

and

producing the semiconductor nanoparticles of claim 1.

18. A method of using semiconductor nanoparticles, the method comprising

dispersing the semiconductor nanoparticles of claim 1 in a solvent to form a mixture;

and

applying the mixture on a substrate to form a thin film.

19. The semiconductor nanoparticles according to claim 3, wherein the at least one poly(alkylene glycol) residue and the function group represented by the formula (1) are each part of a compound represented by the following formula (2):

20. The semiconductor nanoparticles according to claim 2, wherein the at least one poly(alkylene glycol) residue is attached to the semiconductor crystals via a mercapto group of a ω

-mercaptofatty acid represented by the following formula (9);